package com.gu.lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @Author: gusongliao
 * @Description: lock 实现间隔加减
 * @createDate 2023/05/27 14:26
 */

// 第一步 创建·资源类，定义属性和操作方法

class Share {

    private int number = 0;

    // 创建LOCK
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();

    // +1
    public void incr() throws InterruptedException {
        // 上锁
        lock.lock();
        try {
            //判断
            while (number != 0) {
                condition.await();
            }

            //干活
            number++;
            System.out.println(Thread.currentThread().getName() + " :: " + number);

            //通知
            condition.signalAll();
        } finally {
            // 解锁
            lock.unlock();
        }
    }

    public void decr() throws InterruptedException {
        //上锁
        lock.lock();
        try {
            // 判断
            while (number != 1) {
                condition.await();
            }
            //干活
            number--;
            System.out.println(Thread.currentThread().getName() + " :: " + number);

            // 通知
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }

}

public class ThreadDemo2 {


    public static void main(String[] args) {
        Share share = new Share();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "AA").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "BB").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "CC").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "DD").start();
    }
}
